I love your attitude. I,m from the old school. We used to rebuild a lot of stuff ourselves. I used to stock all the popular sizes of wheel cyl cups. Now the stores don,t even stock wheel cyl kits. Some of the brakes now they wan,t to sell you the whole backing with cyl,s &shoes & attaching parts. I think the cups are still available but you would have to buy a box of 10.
I still do my own starters & Alternators.